I use ordinal fractions.
nms=.'000';'100';'200';'110';'120';'210';'220';'230';'211';'221';'222';'223'
The digits are ordinal numbers, 1, 2, 3, . . . rather than cardinal numbers 0,
1, 2, . . .
The digit zero means everything rather than nothing.
nms=.'000','100','200','110','120','210','220','230','211','221','222',:'223'
nms=.(/:nms){nms NB. sort
(3-~+/"1 nms='0')|."0 1 nms,"1' '
000
100
110
120
200
210
211
220
221
222
223
230
This is not the J concept of array, but something else.
Den søndag den 19. juli 2020 22.13.08 CEST skrev Devon McCormick
<[email protected]>:
Does anyone have a good way to display a tree in J? EG
C:
|__n0
| |_n00
| |_n01
|
|__n1
|__n10
| |__n100
|__n11
| |__n110
| |__n111
| |__n112
|__n12
for a tree in parent index form:
tr=. _1 0 0 1 1 2 2 2 5 6 6
6
nms=.
'C:';'n0';'n1';'n00';'n01';'n10';'n11';'n12';'n100';'n110';'n111';'n112'
Where "tr" is the parent-index form (with _1 for the root) and "nms" are
the names of each node.
Any other neat representation of a tree would also be appreciated.
Thanks,
Devon
--
Devon McCormick, CFA
Quantitative Consultant
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